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s s • TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHfNG AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(µg/L2 Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE MWI 12/18/02 638 1726 -1088 000 -- -_ _- __ __ -- MWI 03/24/03 638 1695 -1057 000 <05 <05 <05 <05 <50 h <05 MW1 06/11/03 638 1691 -1053 000 -- -- -- -- -_ -- MWI 09/17/03 638 1823 -1185 000 MWI 12/08/03 638 1829 -1191 000 -- -- _- __ -- MWI. 03/02/04 638 1675 -1037 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MWI 06/28/04 638 1791 -1153 000 -- -.- _- MW2 01/87 877 -- -- -- 26 190 -- 1,100 11,000 -- MW2 07/16/87 877 1880 -1003 000 68 26 630 1,320 4,800 -- MW2 04/11/88 877 21 89 -13 12 000 94 <20 240 880 11,000 -- MW2 09/13/88 877 2432 -1555 0 00 600 62 520 1,900 7,400 -- MW2 11/16/88 877 2447 -1570 000 840 140 650 1,600 10,000 -- MW2 02/09/89 877 2902 -2025 000 480 55 660 1,700 7,200 -- MW2 05/31/89 877 2569 -1692 000 680 62 800 3,100 17,000 -- MW2 08/17/89 877 2733 -1856 000 2,100 430 350 1,700 15,000 -- MW2 12/19/89 877 2768 -1891 000 -- -- -- -- _- MW2 877 Well dry since 03/21/90 MW2 05/11/95 877 24 19 -1542 000 34 41 83 1,000 5,200 -- MW2 08/24/95 877 2280 -1403 000 80 <5 0 150 130 2,800 -- MW2 10/19/95 877 2599 -1722 000 24 <5 0 48 13 1,300 <25 MW2 02/13/96 877 2384 -1507 000 49 <2 5 65 17 1,300 -- MW2 04/18/96 877 2098 -1221 000 -- -- -- _- -- -- MW2 08/08/96 877 2275 -1398 000 19 <0 5 41 11 490 68 MW2 11/04/96 877 2277 -1400 000 25 <0 5 65 14 810 21 MW2 02/03/97 877 1861 -984 000 -- -- -_ -- __ -- MW2 05/08/97 749 1825 -1076 000 1 2 <0 5 1 1 <0 5 73 <2 5 MW2 08/26/97 749 2003 -1254 000 -- -- -- __ __ -- MW2 11/11/97 749 2056 -1307 000 3 2 <0 5 3 4 0 71 160 5 2 MW2 03/03/98 749 1490 -741 000 14 <0 5 1 2 <0 5 110 3 3 MW2 03/03/98 749 <2 0* MW2 05/20/98 749 1486 -737 000 15 <0 5 1 1 <0 5 110e 41 g\pm3ecls1739421mastcAwp1gO7O4U942gw As Page 5 of 54